Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
 You are Here: Home >< Maths

# Goodness of fit S3 watch

1. I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

Any ideas?
Attached Images

2. (Original post by Katiee224)
I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

Any ideas?
please post to the maths help forum
http://www.thestudentroom.co.uk/forumdisplay.php?f=38
3. (Original post by Katiee224)
I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

Any ideas?
it may be that you are looking at cumulative binomial tables... to look up "exactly 5" for instance you would do "cumulative to 5" - "cumulative to 4"
4. (Original post by Katiee224)
I am struggling to understand this example. I can't find the values listed in the first table for the probability of x, from the binomial distribution tables. Are these values wrong? I can only find 0.1074, im looking at the table for B(10,0.2)

Any ideas?
I'm guess they're talking about the cumulative binomial tables ( you could find out each P(X=x) by doing P(X =x) = P(X less than or equal to x) - P(x less than or equal to x -1) but if you can't see that also try calculating P(x=1), i.e 10C1 * 0.9^9 * 0.2.

Edit: Should be 0.8^9. Sorry!
5. (Original post by the bear)
it may be that you are looking at cumulative binomial tables... to look up "exactly 5" for instance you would do "cumulative to 5" - "cumulative to 4"
(Original post by SeanFM)
I'm guess they're talking about the cumulative binomial tables ( you could find out each P(X=x) by doing P(X =x) = P(X less than or equal to x) - P(x less than or equal to x -1) but if you can't see that also try calculating P(x=1), i.e 10C1 * 0.9^9 * 0.2.
I feel really stupid now haha so obvious

thanks guyyssss

Reply
Submit reply
Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 21, 2015
Today on TSR

### Congratulations to Harry and Meghan!

But did you bother to watch?

Poll
Useful resources

## Make your revision easier

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.